There are all kinds of crystals – and the idea is a bit complicated. It’s all about how atoms and molecules come together to make very specific shapes. Snowflakes are crystals and so is salt and sugar and ice. And so are a lot of stones and rocks – especially in places that have cool natural awesomeness like Sophie and Sadie are seeing on their trip visiting the US National Parks. Looks like they found a shop that sells crystals […]
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